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Hey Tanuj,

At one point, you used $q_{i}$ and $p_{u}$ to describe the latent features, then changed it to $f_{i}$ and $g_{u}$ .

If the correct way is

$(\sum_{< u, i, r > \in D} (r^{'} + b_{i} + c_{u} + (\sum_{\overline{s}} f_{i k} g_{k u}) - r)^{2}) + (λ (b_{i}^{2} + c_{u}^{2} + \sum_{k} (f_{i k}^{2} + g_{k u}^{2})))$
Then where are the indices $i$ and $u$ for the second term coming from...? What is the outermost bracket supposed to mean?

What are the differences now that you've made this change?

TianQiChen (talk)‎